That’s strange. Windows sometimes displays that message, when we released a new version but we quickly get the reputation needed to avoid. Unfortunately Microsoft has chosen to respect the fact that we’re digitally signed with a proper certificate.
You should be able to run it anyway, under More Info. See here: http://www.howtogeek.com/123938/htg-explains-how-the-smartscreen-filter-works-in-windows-8/ . Do you have a screen shot of the “More Info” screen?
Also, ensure that you downloaded the most recent version of AxCrypt from https://www.axcrypt.net/ and that the digital signature is correct by checking file properties after download, and select “Digital Signatures”.